Q128 / 180 · AIIMS 2018 (27 May) · Physics

A paramagnetic substance of susceptibility $3 \times 10^{-4}$ is placed in a magnetising field of $4 \times 10^{-4} \mathrm{~A} \mathrm{~m}^{-1}$. Then the intensity of magnetisation in the units of $\mathrm{A} \mathrm{m}^{-1}$ is

  • A
    $1.33 \times 10^8$
  • B
    $0.75 \times 10^{-8}$
  • Correct answer
    C
    $12 \times 10^{-8}$
  • D
    $14 \times 10^{-8}$

Solution

$\begin{aligned} I & =\chi H=\left(4 \times 10^{-4}\right) \times\left(3 \times 10^{-4}\right) \\ & =12 \times 10^{-8} \mathrm{~A} \mathrm{~m}^{-1}\end{aligned}$

Hence, the correct answer is option: 'C'.

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